Service Manual
Integra E-Z Oxygen Concentrators
Chart SeQual Technologies Inc. Page 18 of 34 P/N 2917
the compressor to start. Allow the unit to come up to room temperature
before operating.
5.3.1. Attempting to start the unit with air pressure already in the system will cause the compressor to
stall. As stated in the Note in section 5.2 a time delay feature has been added to prevent the unit
from starting until the pressure in the system has bled down.
5.3.2. Unplug unit, open covers and check to ensure the compressor can be rotated by turning the fan
by hand. If this is difficult to do then there is a compressor malfunction and the compressor
must be serviced or replaced.
Warning: Ensure the unit is unplugged before testing this operation.
Warning: Use a glove or similar hand protection to rotate the fan, the plastic edges can
be sharp and cut your hand.
5.3.3. Check for damage to the traces on the circuit board. Failure of an internal component can
cause excessive power draw. This will typically result in burn marks adjacent to the eight-pin
connector that can be observed with the back cover removed. Contact SeQual Customer
Service for assistance.
5.4. Unit does not produce adequate oxygen flow
5.4.1. Check to verify that the target flow set point is correct
5.4.2. Check for a blocked humidifier bottle (if one is being used). Tip: Remove for testing.
5.4.3. Check for external kinked, flattened, or blocked tubing or accessories (remove accessories from
DISS fitting and see if adequate flow is coming out of the DISS fitting).
5.4.4. Remove covers and check for internal kinked, flattened, or blocked tubing.
5.4.5. Check the inside of the unit for loose or disconnected tubing.
5.4.6. Check for operation of the flow control valve (open and close the valve by pushing the “+” and
“-“ buttons and look for or feel the valve moving/stepping).
5.4.7. Check for air flow blockage in elbow-muffler connection. Replace muffler if necessary.
5.5. Unit starts but shuts down after a short period of operation
5.5.1. Re-start the unit and check for adequate airflow (refer to Operation and Set-up).
5.5.2. Check for cooling fan operation. Air should be blowing out of the bottom of the cabinet and
can be felt by putting a hand under the base. If no Air flow is present:
5.5.3. Unplug the unit, remove the covers and check cooling fan for blockage. Plug the unit back in
and check for line voltage at the fan connector. If not present, check to ensure the eight-pin
connector (J10) is securely connected at the printed circuit board. If the connection is “good”,
then replacement of the printed circuit board or POD assembly may be required. Contact
SeQual Customer Service for assistance.
5.6. Compressor pressure relief valve actuates
5.6.1 Turn unit ON and check for valve rotation on the ATF. Loosen the four clamp screws attaching
the ATF to the base, sufficiently to lift the ATF out of the nest to rotate the ATF onto its side
being careful not to hit the gearmotor on the base. It is not necessary to remove any tubing or
hoses. Lay the ATF on its side on the base and look at the gearbox for the drive shaft rotation.
NOTE:
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